Pipe-threading tool.



J. B. PHILLIPS. PIPE THREADING TOOL. APPLICATION FILED NOV. 25, 1908.

952,629. Patented Mar. 22, 1910.

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IHH v N N 03 l N o mum m-mnmmm mm Q 8141mm akmB.P/ ;4g Wihwoom I(lttmmwfg J. B. PHILLIPS. PIPE THREADING TOOL. APPLICATION FILED NOV.25, 1909.

Patented Mar.22, 1910.

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- UNITED STATES PATENT oEEIcE.

JOHN B. PHILLIPS, OF WARREN, OHIO, ASSIGNOR TO THE BURDEN COMPANY, OFWARREN, OHIO, A CORPORATION OF OHIO.

PIPE-THREADING TOOL.

To all whom it may concern:

Be it known that I, JOHN B. PHILLIPS, of \Varren, in the county ofTrumbull and State of Ohio, have invented certain new and usefulImprovements in Pipe-Threading Tools; and I do hereby declare the following to be a full, clear, and exact description of the invention, suchas will enable others skilled in the art to which it appertains to makeand use the same.

In the class of tools now in general use for cutting threads on pipes orbolts lead screws are almost invariably necessary for ease in startingand to insure the proper pitch and proportioning of the thread. The useof lead screws has heretofore been open to serious objection becausegrit and pipe cuttings strip the threads or cause the stock to bind.Then again, the presence of any foreign substance results in thepremature wear of the threads.

The primary object of my invention is to provide improved means forobviating all the difliculties above recited, and thus prolong the lifeof a tool, increase its range of efficiency, and reduce the cost ofreplacing injured parts.

The invention will be hereinafter fully set forth and particularlypointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical longitudinalsectional view of a threading tool equipped with my improvement. Fig. 2is an end view, parts being broken away. Fig. 3 is a view of the leadscrew detached. Fig. 4 is a view of the cooperating threaded member ofthe workholder. Fig. 5 is a view of the inner guard band. Fig. 6 is aview of the locking ring.

Referring to the drawings, 1 designates the housing which has on itsrear face a circular seat for one end of a sleeve 2, the exterior ofwhich is smooth save for leadscrew threads 3 extending a short distanceinwardly from the free end. I have shown this sleeve as having in itswall opposite slots 4 at right angles to its axis for receiving the endsof plates 5 which are held by bolts 6 to the rear face of the housing,such bolts being passed through slots in such plates. By this means thelead screw sleeve is rendered detachable from the housing, it beingnecessary to only loosen bolts 6 and slide plates 5 outwardly. Thus anew lead Specification of Letters Patent.

Application filed November 25, 1908.

Patented Mar. 22, 1910.

Serial No. 464,351.

screw, or one differently threaded, may be readily substituted.

The work-holder comprises a cylindrical barrel 7 and an interiorlythreaded collar 8 in which the thread of the lead screw works. Thecollar 8 fits within barrel 7 and seats against an inwardly extendedfiange 9 of the barrel, the prolongation of this flanged portion fittingagainst the smooth or unthreaded portion of sleeve 2, while its exterioris threaded to receive a retaining nut or ring 1O.

12 designates an inner guard band carried by the work-holder andextending into the bore of sleeve 2 by which it is telescopcd. This bandat its outer end has a flange 1?) which serves to retain collar 8 inposition, and it is locked thereto by a key plate let carried by alocking ring 15 held within the end of barrel 7 by the ordinary pipecentering screws 16. In this way the several parts constituting thework-holder are fixedly held together. The flanged or reduced portion ofbarrel 7 prevents any foreign substance entering from without the threadof the lead screw, while the flanged band 12 effectively excludesentrance from within, protecting alike the thread of the lead screw andthe thread of the collar.

As is well known, threading tools are centered on the pipe to bethreaded, and as the operation progresses the housing, together with thelead screw, travels toward the work-holder. As the lead screw works incollar 8 it further telescopes the inner guard band 12 and the outerbarrel 7, both of which being in close contact with the sleeve of thelead screw effectively exclude foreign substances.

It is manifest that my present improvements are adaptable to variousstyles of threading tools and machines. I have shown them applied to awell known form of threading tool in which the radially arranged chasersare caused to recede by the axial rotation of a chaser-engaging plate,which rotation is effected by means mounted. on the workholder, thesupport for such means, in the present instance, being shown as a band17 held on the work-holder by nut 10.

The advantages of my invention will be apparent to those skilled in theart to which it relates. It will be observed that by protecting the leadscrew as Well as the 00- operating member of the Work-holder all dangerof the threads being injured by pipe cut-tings etc. is obviated, and thelife of such threads is prolonged.

I claim as my invention:

1. In a pipe threading tool, in combination, a housing, a sleeveextending therefrom threaded at one end, a barrel telescoping saidsleeve and having an inwardly extended flange at its inner end forming acircular shoulder, an interiorily threaded col lar within said barrelheld against said shoulder, said collar engaging the thread of saidsleeve, a guard band fitted Within said sleeve and having anoutwardlyextended flange bearing againstthe outer edge of said collar, alocking ring, means for securing the latter to said barrel, and a keyfor uniting said ring, guard band and collar.

2. In a pipe threading tool, in combination, a housing, a sleeveextending therefrom threaded at one end, a barrel telescoping saidsleeve and having an inwardly extended flange at its inner end forming acircular shoulder, an interiorly threaded collar Within said barrel heldagainstsaid shoulder, said collar engaging the thread of said sleeve, aguard band fitted Within said sleeve and having an outwardly-extendedflange bearing against the outer edge of said collar, said flange andcollar having coincident grooves, a locking ring detachably held Withinthe outer end of said bar rel, and a key-plate secured to said ring andfitted in said grooves.

In testimony whereof, I have signed this speclficatlon 1n the presenceof tWo subscrib- 111g witnesses.

JOHN B. PHILLIPS.

Vitnesses WM. A. BEorrrEL, GRANDON MORAN.

